Disable anonymous logins to Grafana by default (when using the teslamate/grafana Docker image)

• The first time you visit Grafana, you will be asked to log in. Use the default user admin with the password admin. After successful login, you will be prompted to change the password.
• To allow anonymous logins set the environment variable of the Grafana image GF_AUTH_ANONYMOUS_ENABLED to true (use only if your Grafana instance is not exposed to the internet!)

This change only affects users who followed the basic Docker installation guide which, as mentioned in the guide, is intended for home network use only and not for exposure to the internet. Users who followed one of the advanced installation guides are not affected as their Grafana instances always had anonymous logins disabled.